
Albert Ramos-Vinolas of Spain returns the ball to Novak Djokovic of Serbia during the men's singles round of 16 match at the French Open Tennis Tournament 2017 in Paris, France on June 4, 2017.(Xinhua/Chen Yichen)

Albert Ramos-Vinolas of Spain returns the ball to Novak Djokovic of Serbia during the men's singles round of 16 match at the French Open Tennis Tournament 2017 in Paris, France on June 4, 2017.(Xinhua/Chen Yichen)